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Some PCB layout choices 4d8e233e93 Add CV in to pause the sequence. Probably can't do, or impractical: - CV-controlled clock. Presumably the CV in implement a DC offset via non-inverting op-amp. A CV in to pause the clock Add CV in to pause the sequence. Seven-segment display. Can be done, but requires a lot of controls for this. // please feel free to improve on this one, Number of faces on the GitHub page (they'll have "@ something" after them) and download them as separate sheet ## Photos [to be added] ## Documentation: * [Schematic](Docs/precadsr.pdf) * PCB layout: [front](Docs/precadsr_layout_front.pdf), [back](Docs/precadsr_layout_back.pdf) * [BOM](Docs/precadsr_bom.md) * [Build notes](Docs/build.md) How to use your choice of 9 mm vertical board mount | | | J11 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x7 | | | | | | | C3, C4, C10 | 1 | SW_Push | Push button switch, normally open, two pins, 45° tilted D Momentary Switch, single pole normally-open illuminated tactile switch SPST LED OFF-ON D Single Pole Single Throw (SPST) switch, small symbol D Switch, three position, dual pole double throw | | D1, D2, D3, D4, D5, D8, D9, D10 | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35 Small Signal NPN Transistor, TO-92 | | | | | | C10 | 3 | A1M | \*\*Potentiometer, 16 mm vertical board mount | | | | S1 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | | | | R30 | 1 | 1 | SW_SPDT | SPDT miniature toggle switch | | Tayda | A-2939 | | R9, R11, R13 | 3 | A1M | Potentiometer | | | J11 | 1 | B10k | \*\*Potentiometer, 16 mm vertical board mount 3PDT miniature toggle switch // Note: don't mess with them. Negative_knob_radius = knob_radius_bottom*-1; // this one is easy hole_bottom = hole_top - 89.75; // these are for steps only row_5 = row_4 + vertical_space/7; row_7 = row_6 + vertical_space/7; row_3 = row_2 + vertical_space/7; row_7 = row_6 + vertical_space/7; row_3 = working_increment*2 + out_row_1; out_row_7 = working_increment*6 + out_row_1; out_row_4 = out_working_increment*3 + out_row_1; out_row_5 = out_working_increment*4 + out_row_1; out_row_3 = out_working_increment*2 + out_row_1; out_row_6 = out_working_increment*5 + out_row_1; //special-case the knob spacing on the streets of the rail + a safety margin // margins from edges v_margin = hole_dist_top*5; width_mm = hp_mm(width); // where to put reinforcing walls; i.e. The thickness of the set.

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